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  • Title: Increasing trap stiffness with position clamping in holographic optical tweezers.
    Author: Preece D, Bowman R, Linnenberger A, Gibson G, Serati S, Padgett M.
    Journal: Opt Express; 2009 Dec 07; 17(25):22718-25. PubMed ID: 20052197.
    Abstract:
    We present a holographic optical tweezers system capable of position clamping multiple particles. Moving an optical trap in response to the trapped object's motion is a powerful technique for optical control and force measurement. We have now realised this experimentally using a Boulder Nonlinear Systems Spatial Light Modulator (SLM) with a refresh rate of 203Hz. We obtain a reduction of 44% in the variance of the bead's position, corresponding to an increase in effective trap stiffness of 77%. This reduction relies on the generation of holograms at high speed. We present software capable of calculating holograms in under 1ms using a graphics processor unit.
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